Body pattern extractor



Aug. 23, 1932.

M. D. SMITH 1,873,227

BODY PATTERN EXTRACTOR Filed Aug. 26, 1931 Patented Aug. 23, 1932 PATENT OFFIQZEJ nearer p; s erra, ornmmmsnam, ALABAMA, ASSIGNOR To SAND smm rntrnnms oonronn'rron, or new YORK, N; A CORPORATION or DELAWARE BDDY PATTERN EXTB'ACTQR Applieet ion filed August 26, 1931. Serial No. 559,575.

This invention is an improvement in body pattern extractors, and morev particularly inadevieei for starting thebody pattern after the ramming of the same.

"In, foundry practice, the sand. for pipes is rammed between the flask and the body pattern, and the. pattern is usually extracted a. ramming machine,. oi means independent of thensual hoist, for initially starting the pattern, that is, for breaking the bond between. thesandland, the pattern, prior to the r mev l r t e e ti l Another object is: the provision ofmechanismi capable of. attachment to, and used with,,the usnalt type franimer, without material changes inethesarne,

these and other objects in view the inyention consists in theconstructi'on and novel, combinationv of parts an described hereinafter, illiistrated in the accompanying drawing, and pointedoutv in the; claims appendedheret it being; understoodthat. variousQ changes in thev form, proportion, .si'ze minor details of constr-lrction. within, the scep -o l he e a ms, may ie v fi Without departing; from the of the invenr b1011 In the drawing forming a parthereof;

Fig. ll-is a longitudinalsection of a' rammi a tmm h fiaskarait ee e likesuppe e li li q Fig.2 is a tdetailz section of. an alternate eonstrnct-ionq'of-starting mechanisml m I-nEthe embodiment of the invention shown in J l g-v 1-, the ramming stool 1 is mounted upenthe, pier 2, and the flask 3 is supported above the same in-the' usual position, rest} ing upon the pattern ringkl and the spigot pattern ,5, ,the latter resting-inturn upon the rammingstool.

'Ilheilask'. 3 has a marginal flange 6,,and olampe'l engage this flange and the ramming stool to. lockthe flask to the stool. Other clamps- 8, indicated indotted lines, areal'so provided, engaging'the top ofthe flange and the stool. The body pattern 9 is arranged within the flask, the butt 10 thereof detachably connected with the pattern, set within the spigot pattern 5.

The ramming stool is bolted firmly to the foundation pier 2, as indicated at'll, and the pier is sufficiently large to maintain the equipment accurately in a vertical position. The body pattern is shown: in ramming'positon in the flask, being properly centered by the engagement of the pattern butt lOfwithin the spigot pattern, and the head pattern 12 is mounted on the, body pattern, and properly centered at the top by the stripping plate 13, which alsocenter's the body'pattern during the ramming operation. The meche anism just described is the typical 001 for the making oi'inol'ds in the manufacture of cast iron pipe. I i I 4 Referring to the drawing, it will be seen that the. head! pattern engages annular sho ulders l4 and lea on the body pattern, and the sandlwhich is indicated at l5, is rammed be tween the flask and the body pattern, the stripping plate, and also the head pattern, if desired, being removed during the insertion of the greater portion of the sand; The upper end of the body pattern is closed,"as shown at 16,, and a elevisll 7 is connected gagement a swivel hook 18 on the cable 19, of ZL SUliialQlB hoist. With this arrangement, d1ffioulty is experienced in breaking the bond between the sand and thebod'y pat- I The said mechanism includes a head 20,

,arrang'ediwithin an enlargement in the lower end ofthe-body pattern, and bearing against an annular shoulder 21' at the innerend of the enlargement. 'The head has. Wings 22 .39 therewith, the clevis being adapted for enl extending, transversely of the upper face thereof on opposite sides ofa diameter, and these wings are connected to the top of the body pattern and the ,cl'evis by means of eye bolts or rods The eyes of the rods are received between the flanges and engage bolts 24 connecting the flanges. The upper ends of the rods pass through the top 16 of the body pattern and the arms of the clevis, and they are engaged by. nuts asshown, to connect the head to the body pattern and to the clevis. V

The internal annular enlargement of the body pattern indicated at 25 provides an air chamber or cylinder, in whichmoves a piston. The piston includes a head 26 having in connection therewith a piston rod '27,

which extends downwardly through 7 an opening in the pattern butt toen'ga'ge with a steel plate 28, resting on the ramming stool. A packing cup 29 of leather or the u like, is connected with the piston head, and

held in proper position by a plate 30 connected to the head by screw bolts, asshown.

Fluid under pressure, as for instance, water or air, is supplied to the cylinder by a pipe 31 extending through the body pattern, and connected'at one end with a suitable source of supply. The. pipe extends through the closed top 16 of. the body pattern, and through the head 20, and it is provided with a suitable valve 32 for controlling the supply.

In operation,the flask with the retaining ring is mounted or centered on the ramming stool. The body pattern is lowered intothe flask, being properly centered at the bottom by the spigot pattern. As the bodypattern comes to rest, the piston rod 27 extends toward the plate 28. In this position the piston is in the upper position, and the cylinder 25 is ready'to receive air for the full stroke of the piston. The centering plate is mounted, and sand is caused to flowbetween the flask and the body pattern, the head pattern being left off at this time to allow the sand to enter. The sand is rammed by hand, or by pneumatic or jolt,rammers,vor

by any other of the usual processes in the manufacture of cast iron pipe. .When the sand is rammed to a certain height, that is, to near the shoulder 14;, the

.ramming process is temporarily halted, the

centering plate is removed, and the head pattern 12 is mounted on thebody pattern. The ramming is then continued until the sand is rammed to the level of the top of the head pattern, at which time the stripping plate is mounted and fastened to the flask by wedges. 33, as shown. Thehook of the pattern hoist is then lowered and engaged with the clevis, and the hoist is operated to take the strain of the body pattern. Atthis moment, fluid under pressure is admitted to the chamber 25. This causes a downward thrust on the piston head 26 and an upward thrust on the head 20, causing the body pattern to move upwardly, breaking the bond between the bodypattern and the sand, thus allowing the hoist to remove the body pattern from the mold with a nominal amount of power.

Either the clamps 7 or 8, or both, may be used, and either type will grip the flask and the ramming stool firmly together, anchoring them to the pier supporting the equipment. InFig- 2, an alternate construction is shown, the body pattern'3t having arranged within the lower end thereof a separable chamber 35, which is connected to the top of; the body pattern by. the rods '36 inithe same manner as in Fig. 1. The piston 37 fits loosely within'the chamber, and it is encircled by a suitable packing indicated generally at 38, which prevents theescape of fluid under pressure from the chamber.

The piston has adepend1ng rod39 corresponding to the rod 27 of Fig. 1. Fluid under pressure is supplied by a pipe 40. Theoperation is preciselythe same as in the Fig." '1 construction. The type just described is intended for the use of air, but of'course,

may be used with other fluid under press re.-

What is claimed as new is; 1. Means to break the bond between the sand and the body pattern of a rammed mold, including a body pattern having at its lower end a chamber for fluid under pressure, and i a piston slidablymo'u'nted in the chamber-and having means tobear against the ramming v stool when fluid under pressure is admitt d tothe chamber.

'2. Means to break the bond between the sand and the body pattern of a rammed mold,"

including a body pattern having at its lower end a chamber for fluid under pressure, and a piston slidably mounted in 'thejchamber' and having means to bear against the ramming stool'when fluid under pressure is admittedto the chamber, the pattern having 4. In a ramming machine, including a stool, a body pattern having a chamber therein, means for initially starting the pattern after the mold is rammed, comprising a piston in saidchamber and having movement therein relative to said body pattern, the piston having a rod extending from the chamher and adapted to engage the ramming stool when the pattern is in place, and meansfor admitting air to the chamber. i

5. In a-ramming machine, including a it stool, a body pattern, means for initially starting the pattern after the mold is rammed, comprising a piston'and a chamber in the body pattern in which the-piston -moves, the pistonhavinga." rod extending from the chamber and adapted to engage the ramming stool when the pattern is in place, and means for admitting air to the chamber, said chamber being formed by the limiting 5 wall of the pattern and a head rigidly connected with the pattern.

6. In a ramming machine including a stool, and a body pattern, means to initially start the pattern after ramming, comprising a piston slidably mounted in the lower end of the pattern and adapted to engage the stool when the piston is moved downward, the pattern having a chamber in which the piston moves, and means to supply fluid under pressure to the chamber. v

7 In a ramming machine including a stool, and a body pattern, means to initially start the pattern after ramming, comprising a piston slidably mounted in the lower end of the pattern, and adapted to engage the stool when the piston is moved downward, the pattern havin a chamber in which the piston moves, a head within the pattern permanently connected to the upper end thereof and forming the inner end of the chamber, and means to supply fluid under pressure to the chamber.

Signed at Birmingham in the county of Jefferson and State of Alabama this 20th day of August A. D1931.

MURPHY D. SMITH. 

